STIGQter: STIG Summary: Mozilla Firefox Security Technical Implementation Guide Version: 6 Release: 8 Benchmark Date: 01 Jul 2026:

Firefox development tools must be disabled.

DISA Rule

SV-251559r961167_rule

Vulnerability Number

V-251559

Group Title

SRG-APP-000266

Rule Version

FFOX-00-000015

Severity

CAT III

CCI(s)

CCI-001312 - Generates error messages that provide information necessary for corrective actions without revealing information that could be exploited.

Weight

Fix Recommendation

Windows group policy:
1. Open the group policy editor tool with "gpedit.msc".
2. Navigate to Policy Path: Computer Configuration\Administrative Templates\Mozilla\Firefox
Policy Name: Disable Developer Tools
Policy State: Enabled

macOS "plist" file:
Add the following:
<key>DisableDeveloperTools</key>
<true/>

Linux "policies.json" file:
Add the following in the policies section:
"DisableDeveloperTools": true

Check Contents

Type "about:policies" in the browser window.

If "DisableDeveloperTools" is not displayed under Policy Name or the Policy Value is not "true", this is a finding.

Vulnerability Number

V-251559

Documentable

False

Rule Version

FFOX-00-000015

Severity Override Guidance

Type "about:policies" in the browser window.

If "DisableDeveloperTools" is not displayed under Policy Name or the Policy Value is not "true", this is a finding.

Check Content Reference

Target Key

5446